:root {
  --bg:           #0B0B14;
  --surface:      #111120;
  --surface-2:    #18182A;
  --border:       #22223A;
  --border-light: #2E2E50;
  --accent:       #6B42F0;
  --accent-hover: #7C55FF;
  --accent-glow:  rgba(107, 66, 240, 0.3);
  --accent-dim:   rgba(107, 66, 240, 0.12);
  --accent-text:  #A08DFF;
  --text:         #E8E6FF;
  --text-muted:   #5E5C80;
  --text-dim:     #2A2840;
  --green:        #56E29F;
  --radius-sm:    6px;
  --radius:       10px;
  --radius-lg:    16px;
  --font-display: 'Playfair Display', Georgia, serif;
  --font-ui:      'Inter', system-ui, -apple-system, sans-serif;
  --font-mono:    'Courier Prime', 'Courier New', monospace;
  --ease:         cubic-bezier(0.22, 1, 0.36, 1);
}

/* ── Reset ────────────────────────────────────────── */
*,
*::before,
*::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  background-color: var(--bg);
  background-image: radial-gradient(var(--text-dim) 1px, transparent 1px);
  background-size: 26px 26px;
  color: var(--text);
  font-family: var(--font-ui);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── App Shell ────────────────────────────────────── */
.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header ───────────────────────────────────────── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 40px;
  background: rgba(11, 11, 20, 0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  gap: 20px;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-pilcrow {
  font-family: var(--font-display);
  font-size: 2.4rem;
  line-height: 1;
  color: var(--accent);
  text-shadow: 0 0 30px var(--accent-glow);
  animation: pilcrow-pulse 4s ease-in-out infinite;
}

@keyframes pilcrow-pulse {
  0%, 100% { text-shadow: 0 0 20px var(--accent-glow); }
  50%       { text-shadow: 0 0 44px rgba(107, 66, 240, 0.55); }
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-title {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
  line-height: 1;
}

.brand-sub {
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* Stats row in header */
.header-stats {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 16px;
}

.stat-chip {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 44px;
}

.stat-value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent-text);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.stat-dot {
  color: var(--border-light);
  font-size: 1.1rem;
  line-height: 1;
}

/* ── Controls Bar ─────────────────────────────────── */
.controls-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 40px;
}

.ctrl-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 20px;
}

.ctrl-divider {
  width: 1px;
  height: 52px;
  background: var(--border);
  flex-shrink: 0;
}

.ctrl-label {
  font-size: 0.64rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  cursor: default;
}

/* Range inputs */
.range-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.range-input {
  -webkit-appearance: none;
  appearance: none;
  width: 138px;
  height: 3px;
  background: var(--border-light);
  border-radius: 99px;
  outline: none;
  cursor: pointer;
}

.range-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 2px var(--accent), 0 0 16px var(--accent-glow);
  cursor: pointer;
  transition: transform 0.15s var(--ease), box-shadow 0.15s var(--ease);
}

.range-input::-webkit-slider-thumb:hover {
  transform: scale(1.25);
  box-shadow: 0 0 0 3px var(--accent), 0 0 24px var(--accent-glow);
}

.range-input::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--bg);
  background: var(--accent);
  box-shadow: 0 0 16px var(--accent-glow);
  cursor: pointer;
}

.range-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 24px;
  background: var(--accent-dim);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-text);
  padding: 0 6px;
}

/* Toggle switches */
.ctrl-options { gap: 8px; }

.toggle-stack {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
}

.toggle-checkbox { display: none; }

.toggle-track {
  position: relative;
  width: 36px;
  height: 20px;
  background: var(--border-light);
  border-radius: 99px;
  transition: background 0.2s var(--ease);
  flex-shrink: 0;
}

.toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: transform 0.2s var(--ease), background 0.2s var(--ease);
}

.toggle-checkbox:checked + .toggle-track {
  background: var(--accent);
}

.toggle-checkbox:checked + .toggle-track .toggle-thumb {
  transform: translateX(16px);
  background: #fff;
}

.toggle-label-text {
  font-size: 0.8rem;
  color: var(--text);
}

.toggle:hover .toggle-label-text {
  color: var(--accent-text);
}

/* Action buttons */
.ctrl-actions {
  flex-direction: row;
  align-items: center;
  padding: 16px 20px;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-ui);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border: none;
  border-radius: var(--radius-sm);
  padding: 8px 18px;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s var(--ease),
              color 0.15s var(--ease),
              box-shadow 0.15s var(--ease),
              opacity 0.15s var(--ease);
}

.btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:not(:disabled):hover {
  background: var(--accent-hover);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:not(:disabled):active {
  transform: scale(0.97);
}

.btn-outline {
  background: transparent;
  color: var(--accent-text);
  border: 1px solid var(--border-light);
}

.btn-outline:not(:disabled):hover {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
}

.btn-ghost:not(:disabled):hover {
  color: var(--text);
  background: var(--surface-2);
}

/* ── Output Area ──────────────────────────────────── */
.output-area {
  flex: 1;
  padding: 48px 40px;
  position: relative;
}

/* Empty state */
.output-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 360px;
  text-align: center;
  gap: 20px;
}

.empty-glyph {
  font-family: var(--font-display);
  font-size: 7rem;
  line-height: 1;
  color: var(--accent);
  opacity: 0.18;
  animation: empty-breathe 3.5s ease-in-out infinite;
}

@keyframes empty-breathe {
  0%, 100% { opacity: 0.14; transform: scale(1); }
  50%       { opacity: 0.28; transform: scale(1.04); }
}

.empty-msg {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-muted);
}

.empty-msg strong {
  color: var(--accent-text);
  font-weight: 600;
}

/* Generated paragraphs */
.output-content {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.para-block {
  opacity: 0;
  transform: translateY(12px);
  animation: para-appear 0.4s var(--ease) forwards;
}

@keyframes para-appear {
  to { opacity: 1; transform: none; }
}

.para-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.para-index {
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-text);
  opacity: 0.65;
  flex-shrink: 0;
}

.para-line {
  flex: 1;
  height: 1px;
  background: var(--border);
}

.para-body {
  font-family: var(--font-mono);
  font-size: 0.97rem;
  line-height: 1.9;
  color: var(--text);
  letter-spacing: 0.008em;
}

/* ── Toast ────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 28px;
  right: 28px;
  background: var(--green);
  color: #001a0d;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 10px 22px;
  border-radius: 99px;
  box-shadow: 0 4px 24px rgba(86, 226, 159, 0.35);
  opacity: 0;
  transform: translateY(12px) scale(0.96);
  pointer-events: none;
  transition: opacity 0.22s var(--ease),
              transform 0.22s var(--ease);
  z-index: 999;
}

.toast.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

/* ── Responsive ───────────────────────────────────── */
@media (max-width: 820px) {
  .app-header {
    padding: 14px 20px;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .header-stats { align-self: stretch; justify-content: space-evenly; }

  .controls-bar {
    flex-direction: column;
    align-items: stretch;
    padding: 0 20px;
  }

  .ctrl-group { padding: 12px 0; width: 100%; }
  .ctrl-actions { flex-direction: row; flex-wrap: wrap; }
  .ctrl-divider { width: 100%; height: 1px; }
  .range-input { width: 100%; max-width: 260px; }

  .output-area { padding: 28px 20px; }
}